THE REPAIR TECHNOLOGY OF THE WORN BEARING HOLE OF REDUCER OF MINE

MA Zhao- ji¹, YUAN Zhuai- long¹, XU Ying- qiang²

^{( 1 Shanxi Aluminium Factory,Hejin 043300, Shaanxi, China)( 2 Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China)}

^{Abstract: The performance of TS2311 matal- mending glue was analysed, and the process of repairing the worn bearing hole of reducer of mine with TS2311 was analysed.The reducer which was repaired operates effectively.}

Key words: mending glue; reducer; repair

Preface:

Reducer is the key to mining ore crushing and belt transportation system Equipment, responsible for important tasks such as crushing and transportation of ore. Reducer Bearing seat hole wear is a common failure form of this equipment. This failureThe effect often leads to reducer oil leakage, increased vibration and noise, and ultimately causes Damage to important parts such as gears or bearings will bring serious consequences to enterprise production. significant economic losses. However, the weight of a general mining reducer is about It is more than 5 t and is often located in an inclined shaft in the mountain. The belt drive device Located at the end of the inclined shaft, when there is a problem with the reducer, due to its conveying. The space on both sides of the belt corridor is narrow, making disassembly, assembly and transportation very difficult. It is difficult, which brings great difficulties to the replacement and overhaul of the reducer as a whole.

This article analyzes the performance of Kesaixin wear-resistant repair agent and proposes the advantages

Use Kesaixin wear-resistant repair agent to solve the problem of 1#ZL130 reducer in a mine.The technical solution for repairing severe wear of the bearing seat hole is implemented through repair. Effectively solved the practical problem of mines.

1. Reducer bearing hole wear problem

Through actual inspection, the No. 1 ZL130 reducer of a mine showed obvious signs of accidents such as oil leakage and increased noise. After on-site disassembly and inspection, we found that the bearing seat of one shaft of the reducer was severely worn, and the wear deviation in the diameter direction was up to 4 . 3 mm, the axial length of the worn surface reaches 50 mm; the end cover of the bearing seat has also been severely worn, with wear reaching 10 mm; the pinion gear is worn, which causes the gear meshing clearance to increase, the operating noise to increase, and leakage to occur at the shaft seat. oil phenomenon. Considering the difficulty of entering the site for maintenance, we decided to repair and repair it on site. The maintenance plan is determined as follows:

(1) The bearing seat cover is restored to its original size through repair welding;

(2) The bearing seat wear is repaired to its original size using Kesaixin anti-friction repair agent;

(3) For one shaft with a small size Depending on the wear and tear of the gear, the method of adding moss to the lubricating oil of the reducer can be used to repair the size of the gear during operation. Among them, Kesaixin anti-friction patching agent to repair the worn parts of the bearing seat is the most critical process of repairing the reducer. The following is the process we determined to use Kesaixin anti-friction patching agent to repair the bearing seat.

2 Performance of Kesaixin TS23111 anti-wear repair agent

2. 1 Good weldability between material and substrate

Kesaixin industrial repair agent is made of ceramics and carbide as aggregates

Molecular alloy composite materials, polymer binders as base materials in materials

The carbide ceramic particles can be tightly welded to the matrix during repair and solidification.

combine. This fully ensures that the repair agent and the repaired matrix are combined into one

one.

2. 2 Has good bonding strength

According to the data, its tensile strength is tested according to GB6329-86.

The value is 32.9 Pa, the shear strength is tested according to GB1724-86, the value

is 24. 4 MPa. After curing, the material can fully meet the stretching requirements of the material.

and shearing requirements.

2. 3 Has high compressive strength

The compressive strength is tested according to GB1041-79, and cured at room temperature can reach

100.6 MPa, heating curing can reach 113.9MPa.

2. 4 Has good resistance to chemical corrosion and corrosion

Once fully cured, the material is resistant to water, emulsions, mineral moisturizers and

Lubricants and synthetic lubricants have excellent corrosion resistance.

2. 5 Has a high heat distortion temperature

Tested according to GB/T1634-1989, the normal temperature curing heat distortion temperature

The temperature reaches 95°C; the heating and curing heat distortion temperature reaches 132°C.

After analysis, Tianshan Kesaixin TS2311 anti-friction patching agent and the above

For this performance, we think it can fully meet the requirements of our mine’s 1#ZL130 deceleration

machine bearing seat hole repair requirements, so we decided to use Tianshan

Saixin TS2311 anti-friction repair agent for mine 1#ZL130 reducer bearings

The seat hole is repaired.

3 Develop a repair process

3. 1 Processing mold

Considering that the bearing selected for the bearing seat is a 7522 bearing, the width of the worn bearing groove is about 50 mm. Accordingly, we can process two molds as shown in Figure 1 for backup.

3. 2 Surface treatment of repaired parts

Use a portable grinder to grind the worn part of the bearing seat into a 1.5mm mesh groove to strengthen the full bonding and welding of the repair agent and the reducer housing. At the same time, it must be noted that the mesh groove should not damage the unworn parts on both sides of the groove used for positioning.

3. 3 Bearing seat surface work

Use a clean brush to clean away the oil dirt and residue on the surface of the bearing seat, and then use Kesaixin Tianshan 1755 high-efficiency special cleaning agent to carefully clean the parts where Kesaixin adhesive is used.

3. 4 Clean the mold and spray 1731 release agent

In order to ensure that the mold can form a uniform film, have a smooth surface, and be easily demolded after use, the mold must be cleaned with a brush before use, and then cleaned with 1755 high-efficiency cleaning agent. After drying, the mold can be evenly sprayed with 1731 metal release agent. surface. Note that the nozzle must be 300~400 mm away from the mold surface. After spraying the release agent, let it sit for 3~5 minutes before use.

3. 5 Prepare the repair agent and apply it to the polished and cleaned area to be repaired. When preparing the repair agent, you must pay attention to the clean environment. The volume mixing ratio of the base material and the curing agent should be 4 1. After the mixture is evenly mixed, at the ambient temperature When the time is around 15, the coating of the area to be repaired should be completed within 45 minutes. Place the two molds on the left and right lower bearing seats respectively, fasten the upper box body, and tighten the fastening bolts according to assembly requirements. Note that the mold cannot be offset. Both ends of the mold should avoid grooves and be placed on an unworn base surface.

3.7 Curing and inspection

Tighten the tightening bolts and let it sit for 48 hours (ambient temperature 15). Disassemble the bolts, remove the mold, trim the corners with a file knife and emery cloth, and check the size and surface quality of the repaired shaft hole.

4 Bearing seat repair implementation and conclusion

On May 21, 2003, we used Tianshan Kesai's new TS2311 anti-friction patching agent to implement the above repair plan on the bearing seat hole of the mine 1# reducer. During the disassembly and inspection on May 26, 2003, we found that the bearing seat hole had reached the original design. According to the dimensional requirements, except for one cavitation hole defect of about 12mm2 (estimated to be caused by the entry of air bubbles when the mold is pressed), the rest of the repaired surfaces are smooth and clean, fully meeting the bearing assembly requirements here. We used the 1680 cylindrical parts retaining agent produced by Beijing Tianshan New Material Technology Co., Ltd. to partially repair the air pocket defects, and the repair effect was good.

In short, the wear repair technology of the reducer bearing seat hole provided in this article is simple and effective. It can shorten the maintenance time, effectively reduce the maintenance cost, improve the safety of maintenance, and ensure the quality of maintenance. The repaired reducer has been running for 750 hours so far. The reducer runs smoothly, without noise, heat, or oil leakage, which has won time and benefits for normal production.